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    <title>Document</title>
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    <script>
        // 抽象工厂方法
        var VehicleFactory = function(subType, superType) {
            // 判断抽象工厂中是否有该抽象类
            if (typeof VehicleFactory[superType] === 'function') {
                // 缓存类
                function F() {};
                // 继承父类属性和方法
                F.prototype = new VehicleFactory[superType]();
                // 将子类构造函数指向子类
                subType.constructor = subType
                    // 子类原型继承父类
                subType.prototype = new F()
            }
        }
    </script>
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